The girl is a figment of his imagination. Either someone he loved who died and thus he imagines her OR the girl never existed in real in the first place and is entirely a figment of Salaar's imagination.
I don't think she is his sister coz other family members would have known otherwise plus the way she addressed him during the rain scene as tum instead of aap, it's clear she isn't his younger sister.
Ye kab hua.. I missed it
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